基于岩芯分级的Hoek-Brown准则参数研究及应用

 地质强度指标(GSI)是Hoek-Brown准则中重要的参数，由于缺乏可具体测量的典型参数，GSI的取值主观性很强。基于工程钻探勘察中对片麻岩岩芯的研究，用野外典型完整岩芯照片和节理面照片代替GSI图里岩体结构的素描图，提出完整岩芯长度指标(RCL)和节理条件(Jc)两参数辅助GSI量化研究；最终建立一个直观的基于岩芯分级的通用GSI图。该GSI图与E. Hoek的方法相比主观误差小，根据该图计算出来的地基极限承载力与地勘单位建议值相比差值很小、精度高，该表可在场地钻探初期岩体力学参数的估算中推广使用。

RESEARCH ON PARAMETERS OF HOEK-BROWN CRITERION AND APPLICATION BASED ON CORE CLASSIFICATION

Geological strength index(GSI) is an important parameter of Hoek-Brown criterion. However，there are not any typically measurable parameters during determination of GSI，which leads to the highly subjective value of GSI. Based on the study of rock mass of detailed geotechnical investigation in the region where is abundant of gneiss，the authors propose that a quantitative analysis method should be used to GSI，according to the parameters such as rock core length(RCL) and Jc，and trying to utilize the photos of the intact core in the field site to substitute the sketch of rock mass structure in GSI，Ultimately，the authors set up a new generalized GSI. In terms of the contrast of calculation of ultimate bearing capacity for rock foundation by the authors and the values given by the unit of investigation，the authors find that the results fit well and the precision is high，which means it is scientific of these charts.